U.S. patent application number 17/600549 was filed with the patent office on 2022-06-09 for vane pump.
This patent application is currently assigned to KYB Corporation. The applicant listed for this patent is KYB Corporation. Invention is credited to Koichiro AKATSUKA, Tomoyuki FUJITA, Kouhei KUBO, Yoshiyuki MAKI.
Application Number | 20220178369 17/600549 |
Document ID | / |
Family ID | |
Filed Date | 2022-06-09 |
United States Patent
Application |
20220178369 |
Kind Code |
A1 |
KUBO; Kouhei ; et
al. |
June 9, 2022 |
VANE PUMP
Abstract
A vane pump is provided with: a pump housing having an
accommodating concave portion; and a pump cartridge accommodated in
the accommodating concave portion, wherein the pump cartridge has:
a rotor; a plurality of vanes received in a plurality of slits
formed in the rotor; a cam ring formed with a cam face on an inner
circumference of the cam ring; and a first side plate provided at
the opposite side from a bottom surface of the accommodating
concave portion such that the cam ring is located therebetween, the
first side plate has a first projected portion projected radially
outward, and the pump cartridge is anchored to the pump housing via
the first projected portion.
Inventors: |
KUBO; Kouhei; (Gifu, JP)
; FUJITA; Tomoyuki; (Gifu, JP) ; AKATSUKA;
Koichiro; (Gifu, JP) ; MAKI; Yoshiyuki;
(Aichi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
KYB Corporation |
Tokyo |
|
JP |
|
|
Assignee: |
KYB Corporation
Tokyo
JP
|
Appl. No.: |
17/600549 |
Filed: |
March 3, 2020 |
PCT Filed: |
March 3, 2020 |
PCT NO: |
PCT/JP2020/008899 |
371 Date: |
September 30, 2021 |
International
Class: |
F04C 15/00 20060101
F04C015/00; F04C 18/344 20060101 F04C018/344; F04C 2/344 20060101
F04C002/344 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 1, 2019 |
JP |
2019-069819 |
Claims
1. A vane pump configured to discharge working fluid by being
rotationally driven by a driving source, comprising: a pump housing
having an accommodating concave portion; and a pump cartridge
accommodated in the accommodating concave portion, wherein the pump
cartridge has: a rotor to which a rotational driving force from the
driving source is transmitted; a plurality of vanes freely slidably
received in a plurality of slits, the slits being formed in the
rotor in a radiating pattern; a cam ring formed with a cam face on
an inner circumference of the cam ring, the cam face being
configured such that tip ends of the plurality of vanes slide on
the cam face as the rotor is rotated; and a first side plate
provided on an opposite side from a bottom surface of the
accommodating concave portion such that the cam ring is located
therebetween, the first side plate has a first projected portion
projected radially outward, and the pump cartridge is anchored to
the pump housing via the first projected portion.
2. The vane pump according to claim 1, further comprising an
annular member fitted into an annular groove, the annular groove
being formed in an inner circumferential surface of the
accommodating concave portion, wherein the annular member comes
into contact with the first projected portion at an opposite side
from the bottom surface of the accommodating concave portion.
3. The vane pump according to claim 2, wherein the pump cartridge
further has: a second side plate provided on an opposite side from
the first side plate such that the cam ring is located
therebetween; and a linkage pin configured to link the cam ring,
the first side plate, and the second side plate, the second side
plate has a second projected portion projected radially outward,
and a first engagement groove is provided in the inner
circumferential surface of the accommodating concave portion so as
to extend along an axial direction, the first engagement groove
being configured to engage with the second projected portion.
4. The vane pump according to claim 1, wherein a second engagement
groove is provided in the inner circumferential surface of the
accommodating concave portion, the second engagement groove being
configured to engage with the first projected portion, the second
engagement groove has an axial groove and a circumferential
direction groove, the axial groove being provided so as to extend
along an axial direction, and the circumferential direction groove
being configured so as to be connected to the axial groove and to
extend in a circumferential direction, and in a state in which at
least a part of the first projected portion is engaged with the
circumferential direction groove, the pump cartridge is anchored to
the pump housing.
Description
TECHNICAL FIELD
[0001] The present invention relates to a vane pump.
BACKGROUND ART
[0002] JP2018-80687A discloses a vane pump provided with a pump
housing having an accommodating concave portion and a pump
cartridge that is accommodated in the accommodating concave
portion. The vane pump described in JP2018-80687A is attached to an
electric motor that is a driving source.
SUMMARY OF INVENTION
[0003] In the vane pump described in JP2018-80687A, the pump
cartridge is fixed by assembling the pump housing to the electric
motor. Therefore, in order to prevent the pump cartridge from being
detached from the pump housing until the vane pump is assembled to
the electric motor, it is required to assemble an anti-detachment
member, such as a cover plate, etc. covering the pump cartridge, to
the pump housing.
[0004] On the other hand, the anti-detachment member needs to be
disassembled from the pump housing when the vane pump is to be
assembled to the electric motor. As described above, because steps
of assembling and disassembling the anti-detachment member to/from
the pump housing are required, the number of man-hours is
increased, and as a result, there is a concern that a manufacturing
cost of an apparatus having the vane pump is increased.
[0005] An object of the present invention is to reduce a
manufacturing cost of an apparatus having a vane pump.
[0006] According to one aspect of the present invention, a vane
pump configured to discharge working fluid by being rotationally
driven by a driving source, includes: a pump housing having an
accommodating concave portion; and a pump cartridge accommodated in
the accommodating concave portion. The pump cartridge has: a rotor
to which a rotational driving force from the driving source is
transmitted; a plurality of vanes freely slidably received in a
plurality of slits, the slits being formed in the rotor in a
radiating pattern; a cam ring formed with a cam face on an inner
circumference of the cam ring, the cam face being configured such
that tip ends of the plurality of vanes slide on the cam face as
the rotor is rotated; and a first side plate provided on an
opposite side from a bottom surface of the accommodating concave
portion such that the cam ring is located therebetween. The first
side plate has a first projected portion projected radially
outward, and the pump cartridge is anchored to the pump housing via
the first projected portion.
BRIEF DESCRIPTION OF DRAWINGS
[0007] FIG. 1 is a sectional view of a vane pump according to a
first embodiment of the present invention.
[0008] FIG. 2 is a sectional view of the vane pump taken along a
line II-II in FIG. 1.
[0009] FIG. 3 is an enlarged sectional view of the vane pump taken
along a line III-III in FIG. 2.
[0010] FIG. 4 is a sectional view of the vane pump according to a
second embodiment of the present invention.
[0011] FIG. 5 is a sectional view of the vane pump taken along a
line V-V in FIG. 4.
[0012] FIG. 6 is an enlarged sectional view of the vane pump taken
along a line VI-VI in FIG. 5.
[0013] FIG. 7 is a sectional view of a modification of the vane
pump according to respective embodiments of the present
invention.
DESCRIPTION OF EMBODIMENTS
[0014] In the following, embodiments of the present invention will
be described with reference to the drawings.
First Embodiment
[0015] A vane pump 100 according to a first embodiment of the
present invention will be described with reference to FIGS. 1 to 3.
FIG. 1 is a sectional view showing a state in which the vane pump
100 according to the first embodiment of the present invention is
assembled to a driving source 50, FIG. 2 is a sectional view
showing a cross-section taken along a line II-II in FIG. 1, and
FIG. 3 is an enlarged sectional view showing a cross-section, in
enlargement, taken along a line III-III in FIG. 2.
[0016] The vane pump 100 is used as a fluid pressure source for a
fluid hydraulic apparatus, such as, for example, a power steering
apparatus, a continuously variable transmission, or the like,
mounted on a vehicle. Oil, aqueous alternative fluid of other type,
or the like may be used as working fluid. As the driving source 50
for driving the vane pump 100, an engine or an electric motor (not
shown) is used.
[0017] As shown in FIGS. 1 and 2, the vane pump 100 is provided
with a pump housing 10 having an accommodating concave portion 11
and a pump cartridge 20 that is accommodated in the accommodating
concave portion 11.
[0018] The pump housing 10 has an attachment surface 10a that is
attached to an attachment surface 52a of a housing 52 of the
driving source 50 and the accommodating concave portion 11 that
opens at the attachment surface 10a. The accommodating concave
portion 11 is a recessed space having a bottom surface 11a, a first
accommodating hole 11b that is formed on the bottom surface 11a
side, and a second accommodating hole 11c that is formed so as to
be continuous with the first accommodating hole 11b and that has
the inner diameter larger than that of the first accommodating hole
11b.
[0019] In addition, the pump housing 10 is provided with a cut-out
portion 11d that is formed by being cut out radially outward from
an inner circumferential surface of the second accommodating hole
11c, a recessed high-pressure chamber 32 that is formed in the
bottom surface 11a, and a discharge passage 33 that communicates
with the high-pressure chamber 32 and opens at the attachment
surface 10a.
[0020] The cut-out portion 11d is provided so as to face a tank
passage (not shown) that opens at the attachment surface 52a of the
housing 52 of the driving source 50, and the discharge passage 33
is provided so as to face a working-oil-supply passage (not shown)
that opens at the attachment surface 52a of the housing 52 of the
driving source 50. Here, the tank passage, which is provided in the
housing 52 of the driving source 50, communicates with a tank (not
shown) for storing working oil, and the working-oil-supply passage
communicates with the fluid hydraulic apparatus that is driven by
the working oil.
[0021] The pump cartridge 20 has: a driven shaft 1 that is
rotationally driven by the driving source 50; a rotor 24 to which a
rotational driving force from the driving source 50 is transmitted
via the driven shaft 1; a plurality of vanes 25 that are
respectively and freely slidably received in a plurality of slits
formed radially in the rotor 24; and a cam ring 26 formed with a
cam face 26a on an inner circumference of the cam ring 26 along
which tip ends of the vanes 25 slide as the rotor 24 is rotated. In
the cam ring 26, a plurality of pump chambers 27 are defined by an
outer circumferential surface of the rotor 24, the cam face 26a of
the cam ring 26, and adjacent vanes 25.
[0022] The driven shaft 1 is a shaft-like member having an
engagement portion 1a that engages with the rotor 24 and a linkage
portion 1b that is provided so as to be projected towards the
driving source 50 from the pump cartridge 20. An outer
circumferential surface of the engagement portion la is subjected
to the spline processing, and the linkage portion 1b is linked to a
drive shaft 51 of the driving source 50 via a joint member 54, such
as an Oldham's coupling, etc.
[0023] The rotor 24 is an annular member and is formed with, at the
center portion thereof, an engagement hole 24a for the engagement
with the engagement portion la of the driven shaft 1 such that the
engagement hole 24a penetrates through the rotor 24 in the axial
direction thereof. An inner circumferential surface of the
engagement hole 24a is subjected to the spline processing. In
addition, a plurality of slits (not shown), which are formed
radially, open at the outer circumferential surface of the rotor
24, and the vanes 25 are respectively received in the slits in a
freely slidable manner.
[0024] The cam ring 26 is an annular member having the
substantially oval-shaped cam face 26a that is formed on the inner
circumferential surface thereof. The cam face 26a has two suction
regions where volumes of the pump chambers 27 are expanded along
with the rotation of the rotor 24 and two discharge regions where
volumes of the pump chambers 27 are contracted along with the
rotation of the rotor 24.
[0025] The pump cartridge 20 further has a first side plate 29 that
is provided on the opposite side from the bottom surface 11a of the
accommodating concave portion 11 such that the cam ring 26 is
located therebetween and a second side plate 28 that is provided
between the cam ring 26 and the bottom surface 11a of the
accommodating concave portion 11.
[0026] As shown in FIG. 2, the first side plate 29 is an annular
member having two arc-shaped suction ports 29a that are formed by
being cutting out. The suction ports 29a are provided so as to
correspond to the suction regions of the cam ring 26 and to guide
the working oil to the pump chambers 27.
[0027] The second side plate 28 is a disc member that is formed
with two arc-shaped through holes each serving as a discharge port
28a. The discharge ports 28a are provided so as to correspond to
the discharge regions of the cam ring 26 and so as to guide the
working oil that has been discharged from the pump chambers 27 to
the high-pressure chamber 32. A guide suction ports for guiding the
working oil to the pump chambers 27 may be provided not only in the
first side plate 29, but also in the second side plate 28 or the
cam ring 26.
[0028] In addition, the pump cartridge 20 has two linkage pins 30
that are inserted through the cam ring 26, the first side plate 29,
and the second side plate 28. Because relative rotation between the
cam ring 26, the first side plate 29, and the second side plate 28
is restricted by the two linkage pins 30, the suction regions of
the cam ring 26 and the suction ports 29a of the first side plate
29 are aligned, and the discharge regions of the cam ring 26 and
the discharge ports 28a of the second side plate 28 are
aligned.
[0029] The pump cartridge 20 that is made into a unit by the
linkage pins 30 is accommodated in the accommodating concave
portion 11 in the pump housing 10 that is formed as described
above.
[0030] Specifically, a part of the second side plate 28 is inserted
into the first accommodating hole 11b of the accommodating concave
portion 11, and the high-pressure chamber 32 is defined by the
second side plate 28. In addition, a space having a predetermined
volume, serving as a suction pressure chamber 31, is formed between
the second accommodating hole 11c and the cam ring 26 and the first
side plate 29 that are inserted into the second accommodating hole
11c of the accommodating concave portion 11.
[0031] As described above, the vane pump 100 in which the pump
cartridge 20 is accommodated in the accommodating concave portion
11 of the pump housing 10 is assembled to the driving source 50 by
fixing the pump housing 10 to the housing 52 of the driving source
50 with a plurality of bolts (not shown).
[0032] As described above, in a state in which the pump cartridge
20 is simply accommodated in the accommodating concave portion 11
of the pump housing 10, there is a concern that the pump cartridge
20 may be detached from the pump housing 10 while the vane pump 100
is being transported or while the vane pump 100 is being assembled
to the driving source 50.
[0033] In order to prevent the pump cartridge 20 from being
detached from the pump housing 10, it is conceivable to assemble an
anti-detachment member, such as a cover plate, etc., covering the
pump cartridge 20 to the pump housing 10. However, such the
anti-detachment member needs to be disassembled from the pump
housing 10 when the vane pump 100 is to be assembled to the driving
source 50. In other words, when the anti-detachment member is
provided, because the number of man-hours is increased due to the
needs of steps of assembling and disassembling the anti-detachment
member, and therefore, there is a concern, as a result, that a
manufacturing cost of an apparatus having the vane pump 100 is
increased.
[0034] In addition, in the pump housing 10, if the pump cartridge
20 can be rotated about the driven shaft 1 in the accommodating
concave portion 11, there is a concern that a discharge pressure
becomes unstable and a pump efficiency is deteriorated. Therefore,
in a state in which the vane pump 100 is assembled to the driving
source 50, it is required to fix the pump cartridge 20 with respect
to the pump housing 10 so as not to be rotatable about the driven
shaft 1 in the accommodating concave portion 11.
[0035] In order to restrict the rotation of the pump cartridge 20,
it is conceivable to insert end portions of the linkage pins 30
into holes formed in the bottom surface 11a of the pump housing 10
or holes formed in the housing 52 of the driving source 50.
However, in either case, it is difficult to see positions of the
linkage pins 30 and the holes when the linkage pins 30 are to be
inserted into the holes. Thus, it is difficult to smoothly insert
the linkage pins 30 into the holes, and therefore, a deterioration
of efficiency of an assembly operation is caused. Furthermore, the
pump housing 10 and the housing 52 of the driving source 50 needs
to be formed with the holes into which the linkage pins 30 are to
be inserted with high accuracy. Therefore, if the rotation of the
pump cartridge 20 is restricted by such a way, there is a concern
that the manufacturing cost of the apparatus having the vane pump
100 is increased.
[0036] Thus, in this embodiment, by providing a configuration in
which the pump cartridge 20 is anchored to the pump housing 10, the
pump cartridge 20 is prevented from being detached from the pump
housing 10 without the need of assembly/disassembly of the
anti-detachment member, etc. Furthermore, in this embodiment, by
providing an anti-rotation device for the pump cartridge 20 at the
position that can be seen, the rotation of the pump cartridge 20 is
restricted, and at the same time, the assemblability of the pump
cartridge 20 to the pump housing 10 is improved.
[0037] In the following, the configuration in which the pump
cartridge 20 is anchored to the pump housing 10 will be
described.
[0038] In order to anchor the pump cartridge 20 to the pump housing
10, the vane pump 100 is further provided with a snap ring 40
serving as an annular member that is fitted into an annular groove
1 le formed in the inner circumferential surface of the second
accommodating hole 11c of the accommodating concave portion 11.
[0039] In addition, arc-shaped first projected portions 29b are
provided on the above-described first side plate 29 so as to
project radially outward from an outer circumferential surface at
two positions such that the driven shaft 1 is located therebetween.
The outer diameter at an outer circumferential surface of the first
projected portion 29b is set so as to be smaller than the inner
diameter of the second accommodating hole 11c. Therefore, the pump
cartridge 20 having the first projected portions 29b projecting
radially outward is accommodated in the accommodating concave
portion 11.
[0040] By fitting the snap ring 40 into the annular groove 1 le in
a state in which the pump cartridge 20 is accommodated in the
accommodating concave portion 11 of the pump housing 10, the snap
ring 40 comes into contact with the first projected portions 29b at
the opposite side from the bottom surface 11a.
[0041] As described above, because the first projected portions 29b
of the first side plate 29 are anchored by the snap ring 40 that is
fitted into the annular groove 11e formed in the pump housing 10,
the pump cartridge 20 is prevented from being detached from the
pump housing 10.
[0042] Therefore, there is no need to attach/detach the
anti-detachment member to/from the pump housing 10 in order to
prevent the pump cartridge 20 from being detached from the pump
housing 10, and therefore, it is possible to improve the
assemblability of the vane pump 100 to the driving source 50.
[0043] Next, a configuration for restricting the rotation of the
pump cartridge 20 will be described.
[0044] As shown in FIGS. 2 and 3, the above-described second side
plate 28 is provided with a second projected portion 28b so as to
project radially outward from an outer circumferential surface of
the second side plate 28. On the other hand, an inner
circumferential surface of the first accommodating hole 11b, into
which the second side plate 28 is inserted, is provided with an
axial groove 11f serving as a first engagement groove, to which the
second projected portion 28b is engaged, so as to extend along the
axial direction of the driven shaft 1.
[0045] By inserting the pump cartridge 20 into the accommodating
concave portion 11 of the pump housing 10 such that the second
projected portion 28b is engaged with the axial groove 11f formed
in the pump housing 10, the rotation of the pump cartridge 20 about
the driven shaft 1 in the accommodating concave portion 11 is
restricted by the second projected portion 28b that is brought into
contact with the axial groove 11f. As described above, by providing
the pump cartridge 20 so as not to be rotatable in the
accommodating concave portion 11, it is possible to stabilize the
discharge pressure of the vane pump 100 and to improve the pump
efficiency of the vane pump 100.
[0046] In addition, the axial groove 11f is formed such that one
end thereof opens in the cut-out portion 11d that is formed by
being cut out radially outward from the inner circumferential
surface of the second accommodating hole 11c. Therefore, it is
possible to insert the pump cartridge 20 into the accommodating
concave portion 11 of the pump housing 10 while visually observing
a situation in which the second projected portion 28b is being
engaged with the axial groove 11f.
[0047] As described above, the restriction of the rotation of the
pump cartridge 20 is achieved with the configuration of a part with
which a check is easily performed while the assembly of the pump
cartridge 20 to the pump housing 10, and thereby, even if the
configuration in which the rotation of the pump cartridge 20 is
restricted is provided, it is still possible to improve the
assemblability of the pump cartridge 20 to the pump housing 10.
[0048] The position to provide the axial groove 11f is not limited
to the region in which the cut-out portion 11d is formed, and the
axial groove 11f may be provided at any position in the inner
circumferential surface of the first accommodating hole 11b as long
as it is easy to recognize the situation while the pump cartridge
20 is being inserted into the accommodating concave portion 11 of
the pump housing 10. In addition, in this case, in order to avoid
an interference with the second accommodating hole 11c, the outer
diameter at an outer circumferential surface of the second
projected portion 28b is set so as to be smaller than the inner
diameter of the second accommodating hole 11c.
[0049] Next, an operation of the vane pump 100 having the
above-described configuration will be described.
[0050] The vane pump 100 assembled to the driving source 50
discharges the working oil by being rotationally driven by the
driving source 50. Specifically, rotation of the drive shaft 51 of
the driving source 50 is transmitted to the driven shaft 1 via the
joint member 54, and the rotor 24 engaged with the driven shaft 1
is then rotationally driven. As the rotor 24 is rotationally
driven, each of the pump chambers 27 is expanded/contracted in
accordance with the profile of the cam face 26a.
[0051] The pump chamber 27 being expanded sucks the working oil
stored in the tank through the tank passage that is formed in the
housing 52 of the driving source 50, the cut-out portion 11d that
communicates with the tank passage, the suction pressure chamber 31
that communicates with the cut-out portion 11d, and the suction
ports 29a that communicates with the suction pressure chamber
31.
[0052] On the other hand, the pump chamber 27 being contracted
supplies the pressurized working oil to the fluid hydraulic
apparatus through the discharge port 28a that is formed in the
second side plate 28, the high-pressure chamber 32 that
communicates with the discharge ports 28a, the discharge passage 33
that communicates with the high-pressure chamber 32, and the
working-oil-supply passage that is formed in the housing 52 of the
driving source 50 and that communicates with the discharge passage
33. As described above, the vane pump 100 sucks the working oil
from the driving source 50 side and discharges the working oil to
the driving source 50 side.
[0053] According to the first embodiment described above, the
advantages described below are afforded.
[0054] In the vane pump 100, the pump cartridge 20 is anchored to
the pump housing 10 via the first projected portions 29b provided
on the first side plate 29, and thereby, the pump cartridge 20 is
held within the accommodating concave portion 11. Therefore, it is
possible to prevent the pump cartridge 20 from being detached from
the pump housing 10 while the vane pump 100 is assembled to the
driving source 50 and to assemble the vane pump 100 to the driving
source 50 without performing any extra steps. As described above,
the member for preventing detachment is no longer required to be
assembled/disassembled, and as a result, it is possible to reduce
the manufacturing cost of the apparatus having the vane pump
100.
[0055] In addition, in the vane pump 100, because the second
projected portion 28b provided on the second side plate 28 is
engaged with the axial groove 11f formed in the pump housing 10,
the rotation of the pump cartridge 20 about the driven shaft 1 in
the accommodating concave portion 11 is restricted. As described
above, by providing the pump cartridge 20 so as not to be rotatable
in the accommodating concave portion 11, it is possible to
stabilize the discharge pressure of the vane pump 100 and to
improve the pump efficiency of the vane pump 100. In addition, the
restriction of the rotation of the pump cartridge 20 is achieved
with the configuration of the part with which the check is easily
performed while the assembly of the pump cartridge 20 to the pump
housing 10, and thereby, even if the configuration in which the
rotation of the pump cartridge 20 is restricted is provided, it is
possible to improve the assemblability of the pump cartridge 20 to
the pump housing 10.
Second Embodiment
[0056] Next, a vane pump 200 according to a second embodiment of
the present invention will be described with reference to FIGS. 4
to 6. In the following description, differences from the
above-described first embodiment will be mainly described, and
components that are the same as those in the vane pump 100
according to the above-described first embodiment are assigned the
same reference numerals and descriptions thereof will be omitted.
FIG. 4 is a sectional view of the vane pump 200 according to the
second embodiment of the present invention, FIG. 5 is a sectional
view showing a cross-section taken along a line V-V in FIG. 4, and
FIG. 6 is an enlarged sectional view showing a cross-section, in
enlargement, taken along a line VI-VI in FIG. 5.
[0057] A basic configuration of the vane pump 200 is similar to
that of the vane pump 100 according to the above-described first
embodiment. In contrast to the vane pump 100 according to the
above-described first embodiment in which the pump cartridge 20 is
anchored to the pump housing 10 via the snap ring 40, the vane pump
200 mainly differs from the vane pump 100 in that the pump
cartridge 20 is anchored to the pump housing 10 directly.
[0058] Similarly to the vane pump 100 according to the
above-described first embodiment, the vane pump 200 is provided
with the pump housing 10 having the accommodating concave portion
11 and the pump cartridge 20 that is accommodated in the
accommodating concave portion 11.
[0059] The pump cartridge 20 has a first side plate 129 that is
provided on the opposite side from the bottom surface 11a of the
accommodating concave portion 11 such that the cam ring 26 is
located therebetween, and the first side plate 129 is provided with
two suction ports 129a and arc-shaped first projected portions 129b
that project radially outward from an outer circumferential surface
of the first side plate 129.
[0060] The first projected portions 129b are provided at two
positions such that the driven shaft 1 is located therebetween, and
the outer diameter at an outer circumferential surface of the first
projected portion 129b is set so as to be larger than the inner
diameter of the second accommodating hole 11c.
[0061] On the other hand, axial grooves 11g and circumferential
direction grooves 11h serving as second engagement grooves with
which the first projected portions 129b are engaged are formed in
the inner circumferential surface of the second accommodating hole
11c of the accommodating concave portion 11 of the pump housing
10.
[0062] The axial grooves 11g are each a groove that is formed so as
to extend along the axial direction of the driven shaft 1, and the
circumferential direction grooves 11h are each a groove that is
formed so as to extend along the circumferential direction from an
end portion of the axial groove 11g towards the rotation direction
of the vane pump 200 shown by an arrow A in FIG. 5.
[0063] As shown in FIG. 6, a width GW1 of the axial groove 11g in
the circumferential direction is set so as to be longer than a
width W1 of the first projected portion 129b in the circumferential
direction, and a width GW2 of the circumferential direction groove
11h in the axial direction is set so as to have a portion that is
slightly smaller than a width W2 of the first projected portion
129b in the axial direction. Specifically, the width GW2 of the
circumferential direction groove 11h in the axial direction is set
so as to become gradually narrower in the direction away from the
axial groove 11g and so as to have the size that is substantially
large enough to fit the first projected portion 129b.
[0064] In the vane pump 200 having the above described
configuration, the first projected portions 129b are respectively
inserted to the axial grooves 11g from the attachment surface 10a
side along the axial direction, and the pump cartridge 20 is
rotated in the rotation direction of the vane pump 200 about the
driven shaft 1. Subsequently, the first projected portions 129b are
caused to engage at least partially with the circumferential
direction grooves 11h, and thereby, it is possible to anchor the
pump cartridge 20 to the pump housing 10 directly.
[0065] As described above, by respectively fitting the first
projected portions 129b of the first side plate 129 to the
circumferential direction grooves 11h formed in the pump housing
10, it is possible to prevent the pump cartridge 20 from being
detached from the pump housing 10.
[0066] In addition, by respectively fitting the first projected
portions 129b to the circumferential direction grooves 11h formed
in the pump housing 10, the movement of the pump cartridge 20 in
the accommodating concave portion 11 is restricted, and at the same
time, the movement of the pump cartridge 20 in the direction in
which the vane pump 200 is rotationally driven is also inhibited by
an end surface of the circumferential direction grooves 11h. As
described above, by providing the pump cartridge 20 so as not to be
rotatable about the driven shaft 1 in the accommodating concave
portion 11, it is possible to stabilize the discharge pressure of
the vane pump 200 and to improve the pump efficiency of the vane
pump 200.
[0067] In addition, after the first projected portions 129b are
respectively fitted into the circumferential direction grooves 11h,
retainer pins 41 to be inserted into the pump housing 10 may be
each provided at the position opposite side from the
circumferential direction groove 11h such that the first projected
portion 129b is located therebetween. As described above, by
arranging the retainer pin 41 in the direction in which the first
projected portion 129b moves out from the circumferential direction
groove 11h, it is possible to restrict the rotation of the pump
cartridge 20 about the driven shaft 1 with high reliability.
[0068] In addition, as shown in FIG. 5, the axial grooves 11g are
each formed such that one end thereof opens at the attachment
surface 10a. Therefore, it is possible to insert the pump cartridge
20 into the accommodating concave portion 11 of the pump housing 10
while visually observing the situation at which the first projected
portions 129b are respectively engaged with the axial grooves 11g
and the circumferential direction grooves 11h.
[0069] As described above, the anchoring of the pump cartridge 20
to the pump housing 10 and the restriction of the rotation of the
pump cartridge 20 are achieved with the configuration of the part
with which the check is easily performed while the assembly of the
pump cartridge 20 to the pump housing 10, and thereby, it is
possible to improve the assemblability of the pump cartridge 20 to
the pump housing 10.
[0070] Because the operation of the vane pump 200 having the above
described configuration is the same as the operation of the vane
pump 100 according to the above-described first embodiment,
detailed descriptions thereof will be omitted.
[0071] According to the second embodiment, the advantages described
below are afforded.
[0072] In the vane pump 200, because the pump cartridge 20 is
anchored to the pump housing 10 via the first projected portions
129b provided on the first side plate 129, the pump cartridge 20 is
held in the accommodating concave portion 11. Therefore, it is
possible to prevent the pump cartridge 20 from being detached from
the pump housing 10 while the vane pump 200 is assembled to the
driving source 50 and to assemble the vane pump 200 to the driving
source 50 without performing any extra steps. As described above,
the member for preventing detachment is no longer required to be
assembled/disassembled, and as a result, it is possible to reduce
the manufacturing cost of the apparatus having the vane pump
200.
[0073] In addition, in the vane pump 200, because the first
projected portions 129b provided on the first side plate 129 are
engaged with the circumferential direction grooves 11h formed in
the pump housing 10, the rotation of the pump cartridge 20 about
the driven shaft 1 in the accommodating concave portion 11 is
restricted. As described above, by providing the pump cartridge 20
so as not to be rotatable in the accommodating concave portion 11,
it is possible to stabilize the discharge pressure of the vane pump
200 and to improve the pump efficiency of the vane pump 200.
[0074] In addition, in the vane pump 200, by only engaging the
first projected portions 129b provided on the first side plate 129
with the circumferential direction grooves 11h formed in the pump
housing 10, the pump cartridge 20 is anchored to the pump housing
10 and the rotation of the pump cartridge 20 in the accommodating
concave portion 11 is restricted. As described above, in the vane
pump 200, it is possible to prevent the pump cartridge 20 from
being detached from the pump housing 10 by a simple configuration
and to improve the pump efficiency by stabilizing the discharge
pressure of the vane pump 200.
[0075] Next, a modification of the respective embodiments described
above will be described.
[0076] In the respective embodiment described above, the pump
cartridge 20 has the driven shaft 1 that is linked to the drive
shaft 51 of the driving source 50. Instead of this configuration,
as shown in FIG. 7, the pump cartridge 20 may not have the driven
shaft 1. In this case, an engagement portion 51a that is formed at
a tip end of the drive shaft 51 of the driving source 50 is engaged
with the engagement hole 24a of the rotor 24 directly. In addition,
in this case, because a through hole through which the driven shaft
1 is to be inserted is not provided in the second side plate 28, it
is possible to simplify the shapes of the second side plate 28 and
the high-pressure chamber 32.
[0077] FIG. 7 shows a configuration in which the drive shaft 51 of
the driving source 50 is directly engaged with the engagement hole
24a of the rotor 24 in the above-described first embodiment.
Similarly, also in the above-described second embodiment, it is
possible to directly engage the drive shaft 51 of the driving
source 50 with the engagement hole 24a of the rotor 24.
[0078] In addition, although the two first projected portions 29b
are provided in the above-described first embodiment, the number of
the first projected portions 29b is not limited to two, and three
or more first projected portions 29b may be provided. Similarly,
although the two first projected portions 129b are provided in the
above-described second embodiment, the number of the first
projected portions 129b is not limited to two, and three or more
first projected portions 129b may be provided.
[0079] In addition, although the first projected portion 29b is
formed to have the arc shape in the above-described first
embodiment, the shape of the first projected portion 29b is not
limited thereto, and the first projected portion 29b may have any
shape as long as the first projected portion 29b has a shape in
which the first projected portion 29b projects radially outward
from the outer circumferential surface of the first side plate 29
so as to be able to come into contact with the snap ring 40.
Similarly, although the first projected portion 129b is formed to
have the arc shape in the above-described second embodiment, the
shape of the first projected portion 129b is not limited thereto,
and the first projected portion 129b may have any shape as long as
the first projected portion 129b has a shape in which the first
projected portion 129b projects radially outward from the outer
circumferential surface of the first side plate 129 so as to be
able to be anchored to the circumferential direction groove
11h.
[0080] The configurations, operations, and effects of the
embodiments of the present invention configured as described above
will be collectively described.
[0081] The vane pump 100, 200 includes: the pump housing 10 having
the accommodating concave portion 11; and the pump cartridge 20
accommodated in the accommodating concave portion 11, wherein the
pump cartridge 20 has: the rotor 24 to which the rotational driving
force from the driving source 50 is transmitted; the plurality of
vanes 25 freely slidably received in the plurality of slit, the
slits being formed in the rotor 24 in a radiating pattern; the cam
ring 26 formed with the cam face 26a on an inner circumference of
the cam ring 26, the cam face 26a being configured such that the
tip ends of the plurality of vanes 25 slide on the cam face 26a as
the rotor 24 is rotated; and the first side plate 29, 129 provided
on the opposite side from the bottom surface 11a of the
accommodating concave portion 11 such that the cam ring 26 is
located therebetween, the first side plate 29, 129 has the first
projected portions 29b, 129b projected radially outward, and the
pump cartridge 20 is anchored to the pump housing 10 via the first
projected portions 29b, 129b.
[0082] In this configuration, because the pump cartridge 20 is
anchored to the pump housing 10 via the first projected portions
29b, 129b provided on the first side plate 29, 129, the pump
cartridge 20 is held in the accommodating concave portion 11.
Therefore, it is possible to prevent the pump cartridge 20 from
being detached from the pump housing 10 while the vane pump 100,
200 is assembled to the driving source 50 and to assemble the vane
pump 100, 200 to the driving source 50 without performing any extra
steps. As described above, the member for preventing detachment is
no longer required to be assembled/disassembled to/from the pump
housing 10, and as a result, it is possible to reduce the
manufacturing cost of the apparatus having the vane pump 100,
200.
[0083] In addition, the vane pump 100 further includes: the snap
ring 40 fitted into the annular groove 11e, the annular groove 11e
being formed in the inner circumferential surface of the
accommodating concave portion 11, wherein the snap ring 40 comes
into contact with the first projected portion 29b at the opposite
side from the bottom surface 11a of the accommodating concave
portion 11.
[0084] In this configuration, the pump cartridge 20 is held in the
accommodating concave portion 11 as the snap ring 40 fitted into
the pump housing 10 comes into contact with the first projected
portions 29b. As described above, with the simple configuration, it
is possible to prevent the pump cartridge 20 from being detached
from the pump housing 10 while the vane pump 100 is assembled to
the driving source 50 and to assemble the vane pump 100 to the
driving source 50 without performing any extra steps. Therefore,
the member for preventing detachment is no longer required to be
assembled/disassembled to/from the pump housing 10, and as a
result, it is possible to reduce the manufacturing cost of the
apparatus having the vane pump 100.
[0085] In addition, the pump cartridge 20 further has: the second
side plate 28 provided on the opposite side from the first side
plate 29 such that the cam ring 26 is located therebetween; and the
linkage pins 30 configured to link the cam ring 26, the first side
plate 29, and the second side plate 28, the second side plate 28
has the second projected portion 28b projected radially outward,
and the axial groove 11f is provided in the inner circumferential
surface of the accommodating concave portion 11 so as to extend
along the axial direction, the axial groove 11f being configured to
engage with the second projected portion 28b.
[0086] In this configuration, because the second projected portion
28b provided in the second side plate 28 is engaged with the axial
groove 11f formed in the pump housing 10, the rotation of the pump
cartridge 20 about the driven shaft 1 in the accommodating concave
portion 11 is restricted. As described above, by providing the pump
cartridge 20 so as not to be rotatable in the accommodating concave
portion 11, it is possible to stabilize the discharge pressure of
the vane pump 100 and to improve the pump efficiency of the vane
pump 100. In addition, the restriction of the rotation of the pump
cartridge 20 is achieved with the configuration of the part with
which the check is easily performed while the assembly of the pump
cartridge 20 to the pump housing 10, and thereby, even if the
configuration in which the rotation of the pump cartridge 20 is
restricted is provided, it is possible to improve the
assemblability of the pump cartridge 20 to the pump housing 10.
[0087] In addition, the second engagement grooves 11g, 11h is
provided in the inner circumferential surface of the accommodating
concave portion 11, the second engagement grooves 11g, 11h being
configured to engage with the first projected portion 129b, the
second engagement groove has the axial groove 11g and the
circumferential direction groove 11h, the axial groove 11g being
provided so as to extend along the axial direction, and the
circumferential direction groove 11h being configured so as to be
connected to the axial groove 11g and to extend in the
circumferential direction, and in a state in which at least a part
of the first projected portion 129b is engaged with the
circumferential direction groove 11h, the pump cartridge 20 is
anchored to the pump housing 10.
[0088] In this configuration, because the first projected portions
129b is engaged with the circumferential direction grooves 11h
formed in the pump housing 10, the pump cartridge 20 is held in the
accommodating concave portion 11. As described above, with the
simple configuration, it is possible to prevent the pump cartridge
20 from being detached from the pump housing 10 while the vane pump
200 is assembled to the driving source 50 and to assemble the vane
pump 200 to the driving source 50 without performing any extra
steps. Therefore, the member for preventing detachment is no longer
required to be assembled/disassembled to/from the pump housing 10,
and as a result, it is possible to reduce the manufacturing cost of
the apparatus having the vane pump 200.
[0089] In addition, in this configuration, because the first
projected portions 129b provided in the first side plate 129 is
engaged with the circumferential direction grooves 11h formed in
the pump housing 10, the rotation of the pump cartridge 20 about
the driven shaft 1 in the accommodating concave portion 11 is
restricted. As described above, by providing the pump cartridge 20
so as not to be rotatable in the accommodating concave portion 11,
it is possible to stabilize the discharge pressure of the vane pump
200 and to improve the pump efficiency of the vane pump 200.
[0090] Embodiments of the present invention were described above,
but the above embodiments are merely examples of applications of
the present invention, and the technical scope of the present
invention is not limited to the specific constitutions of the above
embodiments.
[0091] This application claims priority based on Japanese Patent
Application No. 2019-69819 filed with the Japan Patent Office on
Apr. 1, 2019, the entire contents of which are incorporated into
this specification by reference.
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